Due diligence is the phase of a business transaction where the buyer verifies everything the seller has represented about the business. It happens after both sides sign a Letter of Intent and before the deal closes. In a typical main street or lower middle market transaction, due diligence lasts 30 to 60 days, though it can stretch to 90 days or more if the business is complex or the buyer is using SBA financing. At VR Business Sales Atlanta, we manage due diligence on every transaction we handle, and it is the phase where more deals die than any other. About 50% of business sales that reach an LOI never make it to closing, and the majority of those failures happen during due diligence. Every one of them is preventable with the right preparation and the right advisor managing the process.

Why Does Due Diligence Exist?

Due diligence exists because a Letter of Intent is not a purchase agreement. The LOI establishes the price, the general deal structure, and the key terms, but it is typically non-binding on the purchase itself. It gives the buyer a defined period to look under the hood and verify that the business is what it appears to be. This protects the buyer from paying for something that does not match the representation, and it protects the seller by creating a structured, time-limited process rather than an open-ended investigation that drags on indefinitely.

Think of it this way. When you buy a house, the inspection happens after you make an offer but before you close. The inspector checks the foundation, the roof, the plumbing, the electrical, and everything else that could affect the value or safety of the property. Due diligence in a business sale is the same concept, except instead of checking pipes and wiring, the buyer is checking financial records, customer relationships, employee arrangements, lease terms, legal compliance, and every other variable that affects whether this business will continue to produce the cash flow they are paying for.

What Does the Buyer Review During Due Diligence?

The scope of due diligence varies based on the size and complexity of the business, but in a typical transaction in the $500K to $10M range that we handle at VR Business Sales Atlanta, the buyer and their advisors will review the following areas.

Financial Verification

This is where due diligence starts and where the most deal-killing surprises tend to surface. The buyer’s CPA or financial advisor will go through your tax returns, profit and loss statements, balance sheets, bank statements, and any internal financial reports you maintain. They are looking for consistency. Do the tax returns match the P&L statements? Do the bank deposits match the reported revenue? Do the expenses line up with what was represented in the Confidential Business Review?

The buyer will also scrutinize the Seller’s Discretionary Earnings recast that was used to establish the valuation. Every addback will be questioned. If you added back $24,000 in health insurance as an owner benefit, the buyer will want to see the insurance statements. If you added back $35,000 for a one-time equipment purchase, the buyer will want proof that it was actually one-time and not a recurring capital expenditure that the business needs every few years. This is why the quality of the SDE recast matters so much. A sloppy recast with unsupported addbacks will fall apart under buyer scrutiny and the valuation collapses with it. At VR Business Sales Atlanta, we build our SDE recasts with the assumption that every number will be challenged, because it will be. For the full breakdown on how SDE works and why it matters, read our post on How Much Is My Business Worth.

Customer Concentration and Revenue Quality

Buyers care deeply about where the revenue comes from. If 40% of your revenue comes from a single customer and that customer has no contract, the buyer is looking at a business where one phone call could wipe out nearly half the income. That is an enormous risk, and it will either kill the deal or result in a significant price reduction.

During due diligence, the buyer will typically request a customer breakdown showing revenue by customer for the past two to three years. They will look at customer retention rates, whether revenue is recurring or project-based, whether customers have contracts or operate on a handshake, and whether any single customer represents a disproportionate share of total revenue. The threshold most buyers and SBA lenders watch is 20%. If any customer exceeds 20% of revenue, it becomes a risk factor that needs to be addressed either through a price adjustment, an earnout structure, or documentation that demonstrates the relationship will survive the ownership transition.

Employee and Management Review

The buyer wants to know who runs the business day to day and whether those people will stay after the sale. This is where owner dependency becomes a critical factor. If you are the owner and you are also the head of sales, the primary customer relationship manager, and the person who opens the doors every morning, the buyer is not buying a business. They are buying a job. And jobs get lower multiples than businesses.

During due diligence, the buyer will review your organizational structure, employee compensation, tenure, and roles. They will want to understand which employees are critical to operations and whether those employees know the business is being sold. They will ask about employment agreements, non-compete clauses, and whether key employees have any incentive to stay through a transition. In some cases, the buyer will want to meet key employees before closing, which creates a confidentiality challenge that needs to be managed carefully.

If you are planning to sell in the next two to five years, reducing owner dependency is the single highest-return investment you can make. Hire or promote a manager who can run operations. Transition your key customer relationships. Document your processes so they are teachable and repeatable. The businesses that command premium multiples are the ones where the owner can take a two-week vacation and nothing breaks. For a deeper look at how to prepare, read our post on How Do I Prepare My Business to Sell.

Lease and Real Estate Review

If the business depends on its physical location, the lease is one of the most important assets in the deal. The buyer will review the current lease terms, the remaining term, renewal options, assignment clauses, and any restrictions that could affect the transfer. SBA lenders are particularly sensitive to lease terms. If the lease has less than two to three years remaining and there is no renewal option, many lenders will not approve the loan because the buyer could lose the location before the loan is repaid.

The landlord’s cooperation is essential and cannot be taken for granted. The buyer needs the landlord to either assign the existing lease or execute a new lease with acceptable terms. I have seen deals where the landlord wanted to double the rent because they knew the business was being sold and saw leverage. I have seen landlords refuse to assign leases entirely. And I have seen deals die three days before closing because the landlord’s attorney raised a last-minute issue that nobody anticipated. At VR Business Sales Atlanta, we advise sellers to engage the landlord early, before the business goes to market, to understand where the lease stands and whether the landlord will cooperate with a transfer.

Legal and Regulatory Compliance

The buyer’s attorney will review the legal structure of the business, including any pending or threatened litigation, regulatory compliance issues, environmental concerns, permits and licenses, intellectual property, and contractual obligations that transfer or terminate upon sale. This is not an area where surprises are tolerable. If there is a pending lawsuit, a regulatory investigation, or an environmental remediation issue, the buyer needs to know about it before they sign the LOI, not after they discover it during due diligence.

Transparency on legal matters is not just ethical. It is strategic. When a buyer discovers something material that was not disclosed upfront, it destroys trust. And once trust is broken in a deal, the buyer starts questioning everything else. A minor issue that could have been addressed with a simple disclosure at the beginning of the process becomes a deal-killer when it looks like it was hidden.

Equipment, Inventory, and Physical Assets

For businesses that rely on physical assets, the buyer will inspect or audit the equipment, vehicles, inventory, and any other tangible property included in the sale. They will compare the asset list in the purchase agreement to what actually exists. They will assess the condition and remaining useful life of major equipment. If inventory is included, they will want a verified count as close to the closing date as possible.

Deferred maintenance is a common due diligence issue. If your delivery trucks need $40,000 in repairs, your HVAC system is at end of life, or your production equipment has not been serviced in two years, the buyer will either reduce the purchase price or require the repairs to be completed before closing. The best approach is to address deferred maintenance before going to market. The cost of the repair is almost always less than the price reduction the buyer will demand.

SBA Loan Coordination During Due Diligence

If the buyer is using SBA 7(a) financing, which approximately 80% of acquisitions in the main street and lower middle market do, the SBA lending process runs in parallel with due diligence. The lender will require a business appraisal, tax transcript verification, source of funds documentation for the buyer’s equity injection, and satisfaction of any conditions in the loan commitment letter.

In 2025, the SBA tightened underwriting standards, reinstated the personal resources test, and added new verification requirements that have extended processing times on certain transactions. An SBA 7(a) loan now takes 60 to 90 days from full application to funding, on top of the due diligence period. This means the total timeline from LOI to closing is typically 90 to 120 days, sometimes longer. Sellers need to understand this timeline going in so they do not panic when the process stretches. Buyers need to have their documentation organized before they start looking at businesses. At VR Business Sales Atlanta, we coordinate directly with SBA lenders throughout the process to keep deals on schedule. For the full breakdown on SBA lending, read our post on What Is SBA Financing and How Does It Work for Business Acquisitions.

How Long Does Due Diligence Take?

For most transactions in the $500K to $10M range, due diligence takes 30 to 60 days. The LOI will specify the due diligence period, and extensions are negotiable but should be avoided if possible because they create uncertainty and give both sides time to develop cold feet. The single biggest factor in due diligence speed is how well the seller is prepared. If your financials are organized, your records are accessible, your lease is transferable, and there are no hidden surprises, due diligence can move quickly. If the buyer’s team has to chase documents, reconcile inconsistencies, and uncover issues that should have been disclosed upfront, the process drags and the deal is at risk.

What Causes Deals to Fail During Due Diligence?

The five most common reasons deals fail during due diligence are financial inconsistencies between tax returns, internal books, and bank statements. Customer concentration that exceeds acceptable risk thresholds with no contractual protection. Undisclosed legal, regulatory, or environmental issues. Lease terms that are insufficient for SBA lending requirements or landlord refusal to cooperate with the transfer. And owner dependency so severe that the buyer cannot see a path to operating the business without the seller. Every one of these is identifiable and addressable before the business goes to market. That is exactly why at VR Business Sales Atlanta, every listing goes through an internal due diligence review before we start marketing to buyers. We would rather have the hard conversation with the seller on day one than watch the deal collapse on day sixty. For the full picture of what an M&A advisor does to prevent these failures, read our post on What Does an M&A Advisor Do.

What Should Sellers Do to Prepare for Due Diligence?

The sellers who have the smoothest due diligence process and the highest closing rates are the ones who prepare before their business ever hits the market. That means organizing three years of clean financial records including tax returns, P&L statements, balance sheets, and bank statements. It means having a clear and defensible SDE recast with documentation supporting every addback. It means knowing where your lease stands and having a conversation with your landlord about transferability. It means identifying any customer concentration risk and being prepared to explain how the relationship will survive the transition. It means disclosing known legal, regulatory, or compliance issues upfront rather than hoping the buyer does not find them. And it means having your team, your processes, and your operations documented well enough that a buyer can see themselves stepping in without the business skipping a beat.

At VR Business Sales Atlanta, we walk every seller through this preparation process before we go to market. The goal is to eliminate surprises, shorten the due diligence timeline, and give the buyer confidence that the business is exactly what it appears to be. That confidence is what gets deals closed.

What Should Buyers Know Going Into Due Diligence?

If you are a buyer evaluating an acquisition in metro Atlanta, due diligence is your opportunity to verify everything and your obligation to ask the hard questions. Do not rely on the seller’s representations alone. Have your CPA review the financials independently. Have your attorney review the legal structure, contracts, and lease. Visit the business location and observe operations firsthand. Talk to the lender early about any conditions that could delay the loan. And build a due diligence checklist that covers every area we discussed above, because the things you do not check are the things that will cost you after closing.

At VR Business Sales Atlanta, we work with both sellers and buyers. For buyers, we help you evaluate the financials, understand the SDE recast, assess deal structure options, and navigate the SBA lending process. Whether you are looking at your first acquisition or adding to an existing portfolio, having professional guidance during due diligence is not optional. It is the difference between buying a business and buying a problem.

Frequently Asked Questions

How long does due diligence take when buying a business?

Due diligence typically takes 30 to 60 days for main street and lower middle market transactions in the $500K to $10M range. The exact timeline depends on the complexity of the business, how well-organized the seller’s records are, and whether the buyer is using SBA financing, which adds its own 60 to 90 day processing timeline. Well-prepared sellers with clean financials and organized documentation can move through due diligence significantly faster.

What documents does a buyer need during due diligence?

Buyers typically need three years of tax returns, profit and loss statements, balance sheets, bank statements, a customer revenue breakdown, employee information including compensation and tenure, the lease agreement, any pending or historical legal matters, equipment and asset lists, vendor and supplier contracts, and any permits or licenses required to operate. At VR Business Sales Atlanta, we provide sellers with a comprehensive due diligence document checklist before the business goes to market so everything is organized in advance.

Can a buyer back out during due diligence?

Yes. The due diligence period exists specifically to give the buyer the right to terminate the transaction if they discover something material that was not disclosed or that changes the risk profile of the acquisition. This is why transparency from the seller is so important. A buyer who feels blindsided by a discovery during due diligence is far more likely to walk away than a buyer who was informed of the issue upfront and had time to evaluate it in context.

What kills the most deals during due diligence?

The most common deal-killers are financial inconsistencies between the tax returns and the internal books, customer concentration above 20% with no contractual protection, lease terms that do not satisfy SBA lending requirements, undisclosed legal or regulatory issues, and owner dependency so severe that the business cannot operate without the current owner. All of these are identifiable and addressable before the business goes to market, which is why working with an experienced M&A advisor before listing is the single most important thing a seller can do to protect their deal.

Do I need an M&A advisor for due diligence?

You are not legally required to have one, but navigating due diligence without professional guidance is where most self-represented sellers get into trouble. An experienced M&A advisor manages the information flow, anticipates buyer concerns, addresses issues before they become deal-killers, and coordinates between attorneys, CPAs, and lenders to keep the process on schedule. At VR Business Sales Atlanta, due diligence management is one of the most important things we do, and it is often the difference between a deal that closes and one that collapses.

Ramzi Daklouche is the Managing Partner of VR Business Sales Atlanta, specializing in main street and lower middle market M&A advisory for businesses valued between $300K and $11M. He co-hosts the podcast Transitions with Claudia and Ramzi covering business sales, acquisitions, and ownership transitions. Contact VR Business Sales Atlanta for a complimentary business valuation consultation.

Related Articles

How Much Is My Business Worth? A Business Broker’s Honest Answer

What Does an M&A Advisor Do? And Why You Probably Need One

How Long Does It Take to Sell a Business?

How Do I Prepare My Business to Sell?

How Do I Sell My Business Without Anyone Finding Out?

How Much Do Business Brokers and M&A Advisors Charge?